the newest iPod classic... some questions

so I have a couple of questions here. I have an iPhone 5 but it's only an 16 gb so it doesn't hold much stuff. I need an iPod that'll pretty much just hold my songs and a couple music videos. I want the iPod classic, but it's very expensive and I don't have the money. so I want to know, one, does apple still sell the older generations of the iPod classic, two, is it a bad idea to buy an older version if available and three what exactly is the difference between the older and newer generations?

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